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Iris missouriensis
WESTERN BLUE FLAG

Higher Taxonomy
Family: IridaceaeView DescriptionDichotomous Key

Common Name: IRIS FAMILY
Habit: [(Annual), shrub], perennial herb generally from [bulb], corm, or rhizome. Stem: generally erect, generally +- round in ×-section. Leaf: generally basal (few cauline), 2-ranked, +- sword-shaped, blade edge-wise to stem, with midvein or not; bases overlapped, sheathing. Inflorescence: generally +- terminal; spikes, umbel-like cymes, or flowers 1; flowers in spikes or 1 subtended by 2 subopposite flower bracts; umbel-like cymes enclosed by 2 subopposite, generally large, leaf-like inflorescence bracts, including various flower bracts. Flower: bisexual (unisexual), radial, with stamens erect, enclosing style, or bilateral, with stamens, style to 1 side, stamens not enclosing style; perianth radial, parts free or generally fused into tube above ovary, generally petal-like, in 2 series of 3, outer +- like inner (or not, in Iris, parts in that genus called sepals, petals), upper +- like lower or not; stamens 3, attached at base of outer 3 perianth parts or in tube, generally free; ovary inferior [(superior)], [(1)]3-chambered, placentas axile [(parietal)], style 1, branches 3, entire to 2-branched, thread- or petal-like with stigma abaxial, proximal to tip. Fruit: capsule, loculicidal. Seed: few to many.
Genera In Family: +- 65 genera, +- 2050 species: worldwide, especially Africa; many cultivated (e.g., Crocus, Dietes, Freesia, Gladiolus, Iris, Sisyrinchium). Note: Gladiolus italicus Mill., Gladiolus tristis L. are urban weeds. Sparaxis grandiflora (D. Delaroche) Ker Gawl., Sparaxis tricolor (Schneev.) Ker Gawl. are waifs.
eFlora Treatment Author: Peter Goldblatt, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: IrisView DescriptionDichotomous Key

Common Name: IRIS
Habit: Rhizome [bulbs, fleshy roots]. Leaf: 2-ranked in basal fan; cauline 0--few, reduced, often bract-like, without development of distal portion. Inflorescence: +- flat cyme, flowers 1--many. Flower: perianth parts +- clawed; sepals generally wider than petals, spreading or reflexed, occasionally with white area in basal 3/4, this generally with smaller yellow area; petals erect; stamens free [(not)]; ovary inferior, style branches petal-like [(not)], arched over stamens, each with scale-like flap (with stigmas on inner surface) opposite stamen and just below 2-lobed tip (crest), with sepals forming 3, 2-lipped units [(not)]. Fruit: loculicidal capsule, rounded or triangular, chambers 3. Seed: generally compressed, pitted, light to dark brown (red).
Species In Genus: +- 160 species: generally northern temperate. Etymology: (Greek: rainbow, from flower colors) Note: Hybrids between some sympatric species; Iris germanica only sp. in California with bearded sepals.
eFlora Treatment Author: Carol A. Wilson

Iris missouriensis Nutt.
NATIVE
Habit: Rhizome 20--30 mm diam. Stem: rarely branched, 20--50 cm. Leaf: basal 3--9 mm wide, base +- purple or not; cauline 1--2, bract-like for at least 2/3 stem length. Inflorescence: flowers 1--2; lowest 2 bracts opposite, generally scarious, enclosing perianth tube, outer 4--8 cm, 5--7 mm wide. Flower: perianth pale lilac to +- white, veined lilac-purple, tube 4--12 mm, funnel-shaped; sepals 4--7 cm, 18--22 mm wide, obovate; petals 4--6 cm, 9--12 mm wide, widely oblanceolate; ovary triangular, style branches 25--35 mm, crests 7--10 mm, stigmas 2-lobed. Chromosomes: 2n=38.
Ecology: Vernally moist grassy or rocky areas; Elevation: 900--3400 m. Bioregional Distribution: KR, NCoR, SN, SCoRI, TR, PR, GB; Distribution Outside California: western North America, northern Mexico. Flowering Time: May--Jul Note: Increases in grazed pastures because leaves unpalatably bitter.
Synonyms: Iris montana Nutt. ex Dykes
Unabridged Note: Coastal populations sometimes included in this sp., here treated as Iris longipetala.
eFlora Treatment Author: Carol A. Wilson
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botanical illustration including Iris missouriensis

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Citation for this treatment: Carol A. Wilson 2016. Iris missouriensis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29292, accessed on May 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 29, 2016.


Iris missouriensis
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© 2015 California Academy of Sciences
Iris missouriensis
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© 2016 California Academy of Sciences
Iris missouriensis
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© 2009 Gary A. Monroe
Iris missouriensis
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© 2009 Gary A. Monroe
Iris missouriensis
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© 2010 Barry Breckling
Iris missouriensis
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© 2003 Christopher L. Christie

More photos of Iris missouriensis in CalPhotos


Geographic subdivisions for Iris missouriensis:
KR, NCoR, SN, SCoRI, TR, PR, GB;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.